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chromium/third_party/blink/web_tests/external/wpt/css/css-nesting/top-level-is-scope.html 

<!doctype html>
<title>Top-level & is treated like :scope</title>
<link rel="author" title="Steinar H. Gunderson" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-nesting-1/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="p">
  <div class="match" id="level1">
    <div class="match" id="level2"></div>
  </div>
</div>

<script>
  test(() => {
    let matched = [];
    for (const elem of p.querySelectorAll('& .match')) {
      matched.push(elem.getAttribute('id'));
    }
    assert_array_equals(matched, ['level1', 'level2']);
  }, '& as direct ancestor');

  test(() => {
    let matched = [];
    for (const elem of p.querySelectorAll('& > .match')) {
      matched.push(elem.getAttribute('id'));
    }
    assert_array_equals(matched, ['level1']);
  }, '& matches scoped element only, not everything');
</script>